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You can conveniently change ports on the Switch through a keyboard commandsequence using the “SCROLL LOCK” key and up and down arrow keys. To sendcommands to the Switch, press the “SCROLL LOCK” key twice within two seconds.You will hear a beep for confirmation. Then you can press the up or down arrowkeys to switch between ports.

OK well usually in the "Setup" you can "Assign" whatever keys you need, so can't you change the keys used to what you have? ALL Keyboards have scroll lock, it is probably just "Hidden" for instance I found one accessed via pressing a Blue Fn Key and then F12. Look carefully for "Other: small writing on keys.

Make sure your keyboard and mouse are plugged into the right USB ports on the switch. If you plug the keyboard into the mouse USB port the hotkeys will not work! The USB ports on the KVM switch are labeled under each port, with a mouse and keyboard icon respectively.From the Quick Start Guide/Manual:
The Numlock hotkeys are listed as:
[Num Lock]+[-] [1]
Switches to output 1
[Num Lock]+[-] [2]
Switches to output 2
[Numlock]+[-] [A]
Auto-scans and chooses which ever port is connected.
Alternatively: Tap [Scroll Lock] twice to automatically switch between ports.
Note: I've never been able to get the Numlock key combinations to work correctly. I always just use double-tap [Scroll Lock] trick to switch.
If you get stuck with your scroll-lock and Alpha lock lights flashing, just hit [Esc] to fix it.
Source: http://www.aten.com/download/download.php#productGuide
(Scroll down to "Quick Start Guide" and choose CS62U out of the drop down).